Every chip must have chip_operations

Forcing this rule, chip_ops can be added in the static devicetree
regardless of the existence of the chip.h files.

Change-Id: Iec1c23484e85cab3f80a34f2b082088f38ac4de9
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/1472
Tested-by: build bot (Jenkins)

util/sconfig/sconfig.h

@@ -86,6 +86,7 @@ struct device *head;
 struct header;
 struct header {
 	char *name;
+	int chiph_exists;
 	struct header *next;
 };